Compatible with 10404 Compact Bizone console. Only works in “1 ZONE”. Adjust over the selected volume in “1 ZONE”. Allows up and down automatic volume depending on the selected volume, based on ambient noise. Analyze of the ambient noise using the microphone 5104 omnidirectional Electret, necessary for its operation. Volume up and down by ±1 dB in one minute time interval. Adjusting gain for volume compensation between music and ambient noise between 0 dB to +20 dB. Connection to the 10404 Compact Bizone console through the DB25 connector. Connection to 5104 microphone through the 3-PIN plug-in terminal strip. Accessory required: microphone 5104 for analyze ambient noise.